Sisters (1927) held by Ulster Museum

These are probably Sayers sisters, and while the woman at right looks a lot like his wife Isobel Sayers, some letters about this painting imply otherwise. So Belle may be in the background, in which case she would be holding daughter Elspeth. There were at least three Sayers sisters who stayed in Scotland as adults.
Oil on canvas, 109.3 x 96.2 cm